Late Season Frost in the Basin

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After a brutal few weeks with temperatures nearing records, we have centered ourselves in a weather pattern that is promoting cooler, yet comfortable afternoon temperatures. A series of cold front moved through at the beginning of the weekend and brought with it a cool air mass that dropped our afternoon temperatures by 5-20 degrees. Clouds have also streamed into the region from the northwest as we have quite a bit of moisture left over from the low pressure system that tracked to the north and through Montana.

Clearing at night in the Klamath Basin will allow for the thermal radiation to escape into the atmosphere. This will not only drop our temperatures overnight, but it will drop them quickly. It will only take a few hours after dusk for temperatures to start plummeting. Areas that see clouds at night will stay a bit warmer, however, some spots are expected to get clearing in the Basin so temperatures will get close to or below freezing for Monday morning. This has prompted a FREEZE WARNING to go into effect at 2 a.m. Monday until 7 a.m. This trend is expected to continue at least until Tuesday morning, so a FREEZE WATCH has been issued for Tuesday morning as well and will include Northeast Siskiyou and Modoc Counties in Northern California. Temperatures are expected to range from 27-35 degrees in the clear spots. Any frost sensitive plants could be damaged or killed if left unprotected.

Fire Danger LevelFire danger level is still in the “Moderate” category for now in Southern Oregon. However, Jackson and Josephine Counties will move to the “High” category on Monday. Dry afternoons are expected with a ridge of high pressure moving in. With the combination of dry air and gusty afternoon winds, spreading of new ignitions can occur rapidly. If you would like to view the restrictions in your area starting Monday click here.

Shower activity is expected in the northern tier of the region Monday afternoon. The leftover moisture with the past system will prompt the creation of some late afternoon cumulus and some of these could produce light, isolated showers. A weak frontal boundary will push through in the afternoon allowing for a few more widespread showers to track their way south. Therefore we can’t rule out a few showers in the Northern Rogue Valley near Grants Pass. The areas that are expected to see the most rainfall will be the coastal areas north of Bandon, and the northern section of the SO Cascades (Crater Lake, Diamond Lake, etc.) The Klamath Basin will see a good chance for isolated showers in the late afternoon, early evening.

After this, the ridge of high pressure will move in clearing us out or leaving a few light cirrus around the area. We will warm up significantly on Wednesday with temperatures jumping up 10-15 degrees in some areas. The weekend will see the weather pattern change again bringing clouds to the region once again. Models are inconsistent on if we will see rain showers again in this period. The way they are shaping up seems to have another thunderstorm situation move in with storms popping up in Northern California, the Klamath Basin, and the mountains. Instability will be increasing, and when this happens, the possibility for thunderstorms and dry lightning increases.

Thanks for logging on and have a great work week!

Meteorologist Seth Phillips

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Photos Submitted Today:

Terry Croft:

A view of Mt. Shasta taken today from Ashland Meadows~along the Pacific Crest Trail at Mt. Ashland

A view of Mt. Shasta taken today from Ashland Meadows~along the Pacific Crest Trail at Mt. Ashland